E21B 33/1216
Anti-extrusion means
Official title: {Anti-extrusion means, e.g. means to prevent cold flow of rubber packing}
E21B33/1216 (Anti-extrusion means) appears on 377 US grants and 382 published applications in this corpus.
Search patents in E21B- Granted patents
- 377
- Published applications
- 382
- Assignees
- 109
- Inventors
- 546
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 2 | 0 |
| 1983 | 2 | 0 |
| 1984 | 3 | 0 |
| 1985 | 5 | 0 |
| 1986 | 2 | 0 |
| 1987 | 0 | 0 |
| 1988 | 4 | 0 |
| 1989 | 5 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 3 | 0 |
| 1993 | 2 | 0 |
| 1994 | 4 | 0 |
| 1995 | 3 | 0 |
| 1996 | 4 | 0 |
| 1997 | 6 | 0 |
| 1998 | 2 | 0 |
| 1999 | 4 | 0 |
| 2000 | 1 | 0 |
| 2001 | 8 | 0 |
| 2002 | 2 | 5 |
| 2003 | 3 | 8 |
| 2004 | 4 | 7 |
| 2005 | 5 | 12 |
| 2006 | 6 | 8 |
| 2007 | 4 | 10 |
| 2008 | 8 | 9 |
| 2009 | 4 | 18 |
| 2010 | 14 | 20 |
| 2011 | 13 | 15 |
| 2012 | 16 | 18 |
| 2013 | 18 | 22 |
| 2014 | 19 | 17 |
| 2015 | 10 | 16 |
| 2016 | 13 | 19 |
| 2017 | 18 | 15 |
| 2018 | 15 | 24 |
| 2019 | 18 | 30 |
| 2020 | 25 | 17 |
| 2021 | 19 | 24 |
| 2022 | 20 | 22 |
| 2023 | 19 | 9 |
| 2024 | 12 | 12 |
| 2025 | 15 | 13 |
| 2026 | 12 | 12 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Retrievable packer element—anti extrusion barrier6 Oct 2026US 12,753,671 B2Expro North Sea Limited
- Garter spring including spacer elements6 Oct 2026US 12,753,672 B2Halliburton Energy Services.Inc.
- Debris protection and retrievability system for bridge plugs and packers4 Aug 2026US 12,698,692 B2Halliburton Energy Services.Inc.
- Packer back-up shoe2 Jun 2026US 12,644,354 B2Halliburton Energy Services.Inc.
- Anti-extrusion element with overlapping segments2 Jun 2026US 12,644,355 B1Halliburton Energy Services.Inc.
- Apparatus for oil well completion using retrievable rotating packer hanger24 Sep 2026US 2026/0286797 A1
- Swell packer with axially activated dual extrusion support10 Sep 2026US 2026/0266156 A1Schlumberger Technology Corporation
- Magnetically graded adaptor for a wellbore sealing system3 Sep 2026US 2026/0258712 A1Halliburton Energy Services.Inc.
- Metal end cap seal20 Aug 2026US 2026/0243348 A1Schlumberger Technology Corporation
- Downhole patch13 Aug 2026US 2026/0235011 A1Welltec A/S
Most cited
By later US patents
- Straight Bore metal-to-metal wellbore seal apparatus and method of sealing in a wellbore216US 5,511,620 A1996
- Removable non-metallic bridge plug or packer196US 6,167,963 ABaker Hughes Incorporated · 2001
- Straight bore metal-to-metal wellbore seal apparatus and method of sealing in a wellbore174US 5,333,692 ABaker Hughes Incorporated · 1994
- Whipstock packer assembly163US 4,765,404 ADrilex Systems, Inc. · 1988
- Subterranean well tool and slip assembly161US 6,354,372 B1Carisella & Cook Ventures · 2002